<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>操作系统模拟</title>
  <style>
    #root {
      margin: 0 auto;
      max-width: 800px;
      min-width: 600px;
      padding: 5px 15px;
    }
  </style>
</head>
<body>
  <div id="root"></div>
</body>
</html>
